CN111708114A - Terahertz polaroid preparation method based on magnetic liquid - Google Patents
Terahertz polaroid preparation method based on magnetic liquid Download PDFInfo
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- CN111708114A CN111708114A CN202010711394.7A CN202010711394A CN111708114A CN 111708114 A CN111708114 A CN 111708114A CN 202010711394 A CN202010711394 A CN 202010711394A CN 111708114 A CN111708114 A CN 111708114A
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- G—PHYSICS
- G02—OPTICS
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- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
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Abstract
The invention provides a preparation method of a terahertz polaroid based on magnetic liquid, wherein the magnetic liquid is curable liquid containing magnetic particles; the preparation method comprises the steps of arranging magnetic particles in magnetic liquid into a polarization structure which can be used for terahertz waves along magnetic lines of force by using a stable magnetic field, and fixing the positions of the magnetic particles by using the solidification transformation of the magnetic liquid after the polarization structure in the liquid is arranged and formed, so that the liquid polarization structure is converted into a solid polarization structure; the terahertz polaroid can be prepared by a simple production process at low cost.
Description
Technical Field
The invention relates to the technical field of magnetic liquid application, in particular to a terahertz polaroid preparation method based on magnetic liquid.
Background
The terahertz wave generally refers to an electromagnetic wave having a band between a millimeter wave of 0.1THz and a far infrared ray of 10 THz. Terahertz waves have the characteristics different from electromagnetic waves such as microwaves, infrared rays, X rays and the like, and have significant research values in the aspects of broadband mobile communication, satellite communication, military radars, object imaging, environment monitoring, medical diagnosis and the like.
Magnetic liquid, also called magnetic fluid, is colloidal suspension formed by uniformly stirring a stabilizer, magnetic particles and a base liquid (or carrier liquid). The magnetic liquid is colloidal suspension containing micron/nanometer magnetic particles, and when no magnetic field acts, the magnetic particles do random thermal motion in the liquid; when an external magnetic field is applied, the magnetic particles are arranged along the direction of the magnetic field to form a chain-shaped structure.
The polaroids applied to terahertz wave bands at present mainly comprise three types: liquid crystal polarizers, metal wire grid polarizers, and carbon nanotube polarizers. The liquid crystal polarizer mainly refers to the ordered arrangement of nematic phase structure molecules under the action of an external electric field, and the insertion loss of the polarizer is usually large, so that the wide application of the polarizer is limited. The metal wire grid type polarizing film can be mainly obtained by processing modes such as precise mechanical processing, laser direct writing technology, photoetching and the like, and is also the terahertz polarizing film which is most widely applied at present. Carbon nanotube polarizers are wire grid structures formed from carbon nanotubes, but such polarizers are still under investigation due to the uncertainty in the growth and transfer of carbon nanotubes, high cost, and low extinction ratio. The preparation cost of the commonly used metal polaroid is high, the process is complicated, the development period is long, and the preparation scheme of the terahertz polaroid with simple process, low cost and stable performance is found, so that the preparation scheme has great commercial value for the research of the high-performance terahertz polaroid.
Disclosure of Invention
The invention provides a method for preparing a terahertz polaroid based on magnetic liquid, which can be used for preparing the terahertz polaroid by a simple production process at low cost.
The invention adopts the following technical scheme.
A terahertz polaroid preparation method based on magnetic liquid is disclosed, wherein the magnetic liquid is curable liquid containing magnetic particles; the preparation method comprises the steps of arranging magnetic particles in magnetic liquid into a polarization structure capable of being used for terahertz waves along magnetic lines of force by using a stable magnetic field, and fixing the positions of the magnetic particles by using the solidification transformation of the magnetic liquid after the polarization structure in the liquid is arranged and formed, so that the liquid polarization structure is converted into a solid polarization structure.
The solid polarization structure is a terahertz polaroid; the magnetic liquid is a colloidal suspension containing micron-sized or nano-sized magnetic particles.
The stable magnetic field is constructed by adjusting the distance between the two permanent magnets;
the preparation method of the magnetic liquid comprises the following steps: firstly, measuring base liquid and magnetic particles, mixing in a container, then putting into an ultrasonic cleaning machine, carrying out ultrasonic vibration stirring to form uniform liquid, and finally adding a curing agent to form magnetic liquid capable of being cured automatically within a set time;
when the terahertz polarizing film is prepared, a proper amount of magnetic liquid is weighed by a scale, the magnetic liquid is placed in a flat vessel, the magnetic liquid in the flat vessel is processed by a stable magnetic field with preset strength, and the magnetic liquid in the flat vessel is taken out after being solidified, so that the terahertz polarizing film is obtained.
The flat vessel is a plastic culture vessel; the sample thickness of the terahertz polaroid is 1 mm.
In the preparation method of the magnetic liquid, a silica gel-silicone oil mixed solution with the mass solubility of 40% of silicone oil is selected as a base liquid, and spherical carbonyl iron powder with the particle diameter of about 100nm is selected as the magnetic particles.
The curing agent is prepared by adding a trace amount of organic tin into tetraethoxysilane.
The preparation method of the terahertz polaroid preparation method comprises the following steps;
step S1: changing the space between two rectangular ferrite magnets of 150mm 100mm 20mm to change the size of the magnetic field in the area between the two permanent magnets so as to construct a relatively uniform magnetic field;
step S2: selecting a silica gel-silicone oil mixed solution with silicone oil mass solubility of 40% as a base solution, adding spherical carbonyl iron powder with the particle diameter of 100nm, weighing the mixture in proportion by using an electronic scale with the precision of 0.001g, mixing the mixture in a beaker, putting the beaker into an ultrasonic cleaning machine for ultrasonic vibration and stirring uniformly, and adding 0.035g of curing agent to prepare a magnetic liquid;
step S3: weighing 0.5g of liquid in a plastic culture dish, homogenizing the liquid by a homogenizer, putting the uniform liquid in a magnetic field to enable the magnetic field to be parallel to the surface of a magnetic liquid sample, and enabling magnetic particles to move in the magnetic liquid under the action of the magnetic field and be arranged into a chain structure required by the function of a polaroid;
step S4: and taking out the liquid in the plastic culture dish after the liquid is solidified into a sheet, thereby obtaining the terahertz polaroid prepared based on the magnetic liquid.
Compared with the prior art, the invention has the following advantages:
the processing method disclosed by the invention has higher processing efficiency. The existing high-precision machining and photoetching technology has complex process and expensive required equipment. Compared with the technology, the method provided by the invention has the advantages that the special physical phenomenon of the magnetic liquid in the magnetic field is utilized to directly prepare the polaroid, other expensive equipment is not needed, the processing efficiency is greatly improved, and the cost is reduced.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of an embodiment of the process of the present invention;
FIG. 2 is an enlarged schematic view of a terahertz polarizing plate prepared by the invention;
FIG. 3 is a schematic diagram of a frequency spectrum measurement result of a terahertz polaroid prepared by the method under different rotation angles;
FIG. 4 is a schematic diagram of a transmission line measurement result of a terahertz polaroid prepared by the method under different rotation angles;
FIG. 5 is a schematic diagram of a frequency spectrum measurement result of a sample of a terahertz polarizing film prepared by the invention after five layers are stacked;
in the figure: 1-a permanent magnet; 2-an object stage; 3-a magnetic liquid; 4-magnetic particles; 5-polarization structure.
Detailed Description
As shown in fig. 1, in a method for preparing a terahertz polarizer based on a magnetic liquid, the magnetic liquid 3 is a curable liquid containing magnetic particles; the preparation method comprises the steps of arranging magnetic particles 4 in magnetic liquid into a polarization structure 5 which can be used for terahertz waves along magnetic lines of force by using a stable magnetic field, and fixing the positions of the magnetic particles by using the solidification transformation of the magnetic liquid after the polarization structure in the liquid is arranged and formed, so that the liquid polarization structure is converted into a solid polarization structure.
The solid polarization structure is a terahertz polaroid; the magnetic liquid is a colloidal suspension containing micron-sized or nano-sized magnetic particles.
The stable magnetic field is constructed by adjusting the distance between the two permanent magnets 1;
the preparation method of the magnetic liquid comprises the following steps: firstly, measuring base liquid and magnetic particles, mixing in a container, then putting into an ultrasonic cleaning machine, carrying out ultrasonic vibration stirring to form uniform liquid, and finally adding a curing agent to form magnetic liquid capable of being cured automatically within a set time;
when the terahertz polarizing film is prepared, a proper amount of magnetic liquid is weighed by a scale, the magnetic liquid is placed in a flat vessel, the magnetic liquid in the flat vessel is processed by a stable magnetic field with preset strength, and the magnetic liquid in the flat vessel is taken out after being solidified, so that the terahertz polarizing film is obtained.
The flat vessel is a plastic culture vessel; the sample thickness of the terahertz polaroid is 1 mm.
In the preparation method of the magnetic liquid, a silica gel-silicone oil mixed solution with the mass solubility of 40% of silicone oil is selected as a base liquid, and spherical carbonyl iron powder with the particle diameter of about 100nm is selected as the magnetic particles.
The curing agent is prepared by adding a trace amount of organic tin into tetraethoxysilane.
The preparation method of the terahertz polaroid preparation method comprises the following steps;
step S1: changing the space between two rectangular ferrite magnets of 150mm 100mm 20mm to change the size of the magnetic field in the area between the two permanent magnets so as to construct a relatively uniform magnetic field;
step S2: selecting a silica gel-silicone oil mixed solution with silicone oil mass solubility of 40% as a base solution, adding spherical carbonyl iron powder with the particle diameter of 100nm, weighing the mixture in proportion by using an electronic scale with the precision of 0.001g, mixing the mixture in a beaker, putting the beaker into an ultrasonic cleaning machine for ultrasonic vibration and stirring uniformly, and adding 0.035g of curing agent to prepare a magnetic liquid;
step S3: weighing 0.5g of liquid in a plastic culture dish, homogenizing the liquid by a homogenizer, putting the uniform liquid in a magnetic field to enable the magnetic field to be parallel to the surface of a magnetic liquid sample, and enabling magnetic particles to move in the magnetic liquid under the action of the magnetic field and be arranged into a chain structure required by the function of a polaroid;
step S4: and taking out the liquid in the plastic culture dish after the liquid is solidified into a sheet, thereby obtaining the terahertz polaroid prepared based on the magnetic liquid.
In this example, in step S3, the plastic petri dish is stably fixed on the stage 2, and the two rectangular parallelepiped ferrite magnets are arranged on both sides of the stage 2, so that the plastic petri dish is located in the magnetic field between the two permanent magnets, and the liquid surface direction of the plastic petri dish is parallel to the magnetic field lines between the two permanent magnets.
FIG. 2 is a partial enlarged view of the polarizer in this embodiment, showing the polarizing structure of the magnetic particles arranged in a linear pattern.
Fig. 3 to 4 are a spectrum measurement result and a transmittance spectrum line of the terahertz polarizing plate in this embodiment at different rotation angles, and it can be seen that the sample has a polarization characteristic.
FIG. 5 is a diagram showing the result of spectrum measurement after stacking five layers of samples of the polarizing plate in this example, wherein 0 can be realized by stacking multiple layers of samplesOThe high frequency transmission is close to zero.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. A terahertz polaroid preparation method based on magnetic liquid is characterized by comprising the following steps: the magnetic liquid is a curable liquid containing magnetic particles; the preparation method comprises the steps of arranging magnetic particles in magnetic liquid into a polarization structure capable of being used for terahertz waves along magnetic lines of force by using a stable magnetic field, and fixing the positions of the magnetic particles by using the solidification transformation of the magnetic liquid after the polarization structure in the liquid is arranged and formed, so that the liquid polarization structure is converted into a solid polarization structure.
2. The method for preparing the terahertz polarizer based on the magnetic liquid according to claim 1, wherein the method comprises the following steps: the solid polarization structure is a terahertz polaroid; the magnetic liquid is a colloidal suspension containing micron-sized or nano-sized magnetic particles.
3. The method for preparing the terahertz polarizer based on the magnetic liquid as claimed in claim 2, wherein the method comprises the following steps: the stable magnetic field is constructed by adjusting the distance between the two permanent magnets;
the preparation method of the magnetic liquid comprises the following steps: firstly, measuring base liquid and magnetic particles, mixing in a container, then putting into an ultrasonic cleaning machine, carrying out ultrasonic vibration stirring to form uniform liquid, and finally adding a curing agent to form magnetic liquid capable of being cured automatically within a set time;
when the terahertz polarizing film is prepared, a proper amount of magnetic liquid is weighed by a scale, the magnetic liquid is placed in a flat vessel, the magnetic liquid in the flat vessel is processed by a stable magnetic field with preset strength, and the magnetic liquid in the flat vessel is taken out after being solidified, so that the terahertz polarizing film is obtained.
4. The method for preparing the terahertz polarizer based on the magnetic liquid according to claim 3, wherein the method comprises the following steps: the flat vessel is a plastic culture vessel; the sample thickness of the terahertz polaroid is 1 mm.
5. The method for preparing the terahertz polarizer based on the magnetic liquid according to claim 3, wherein the method comprises the following steps: in the preparation method of the magnetic liquid, a silica gel-silicone oil mixed solution with the mass solubility of 40% of silicone oil is selected as a base liquid, and spherical carbonyl iron powder with the particle diameter of about 100nm is selected as the magnetic particles.
6. The method for preparing the terahertz polarizer based on the magnetic liquid according to claim 3, wherein the method comprises the following steps: the curing agent is prepared by adding a trace amount of organic tin into tetraethoxysilane.
7. The method for preparing the terahertz polarizer based on the magnetic liquid according to claim 3, wherein the method comprises the following steps: the preparation method of the terahertz polaroid preparation method comprises the following steps;
step S1: changing the space between two rectangular ferrite magnets of 150mm 100mm 20mm to change the size of the magnetic field in the area between the two permanent magnets so as to construct a relatively uniform magnetic field;
step S2: selecting a silica gel-silicone oil mixed solution with silicone oil mass solubility of 40% as a base solution, adding spherical carbonyl iron powder with the particle diameter of 100nm, weighing the mixture in proportion by using an electronic scale with the precision of 0.001g, mixing the mixture in a beaker, putting the beaker into an ultrasonic cleaning machine for ultrasonic vibration and stirring uniformly, and adding 0.035g of curing agent to prepare a magnetic liquid;
step S3: weighing 0.5g of liquid in a plastic culture dish, homogenizing the liquid by a homogenizer, putting the uniform liquid in a magnetic field to enable the magnetic field to be parallel to the surface of a magnetic liquid sample, and enabling magnetic particles to move in the magnetic liquid under the action of the magnetic field and be arranged into a chain structure required by the function of a polaroid;
step S4: and taking out the liquid in the plastic culture dish after the liquid is solidified into a sheet, thereby obtaining the terahertz polaroid prepared based on the magnetic liquid.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7094470B1 (en) * | 2021-08-03 | 2022-07-01 | 三菱電機株式会社 | A extruder, a polarizing element application device, and a method for manufacturing a polarizing element. |
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| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
| CN109298555A (en) * | 2018-10-25 | 2019-02-01 | 南开大学 | Terahertz magnetic nano-liquid crystal phase-shifter and preparation method thereof |
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| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
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| JP7094470B1 (en) * | 2021-08-03 | 2022-07-01 | 三菱電機株式会社 | A extruder, a polarizing element application device, and a method for manufacturing a polarizing element. |
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